/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.metrics;

/**
 * A metric which calculates the distribution of a value.
 * 直方分布指标，例如，可以用于统计某个接口的响应时间，可以展示50%, 70%, 90%的请求响应时间落在哪个区间内
 *
 * @see <a href="http://www.johndcook.com/standard_deviation.html">Accurately computing running
 *      variance</a>
 */
public interface Histogram extends Metric, Sampling, Counting {

    /**
     * Adds a recorded value.
     * 将某个整型值添加到
     *
     * @param value the length of the value
     */
    void update(int value);

    /**
     * Adds a recorded value.
     *
     * @param value the length of the value
     */
    void update(long value);

}
